Allow soil to dry out completely between waterings. Reduce watering significantly during winter dormancy. Overwatering can lead to root rot.

Ensure good drainage to prevent waterlogged conditions, especially in cooler months.

Pruning is generally not required for Gymnocalycium pflanzii unless removing dead or damaged parts. If offsets need to be separated, use a clean, sharp knife. Avoid excessive pruning as it can stress the plant.

Propagation is typically done through offsets (pups) that form around the base of the mother plant. Carefully remove offsets with a sharp knife and allow them to callus for a few days before planting in a well-draining cactus mix.

Repot every 2-3 years or when the plant outgrows its container, preferably in spring. Use a gritty, well-draining cactus potting mix. Choose a pot slightly larger than the previous one, ensuring adequate drainage holes.